Projector auto rewind mechanism

ABSTRACT

A motion picture projector having a forward and reverse film transporting drive, an assembly for sensing a predetermined film tension condition and a mode controller for selecting various operational modes is provided with a control for selectively actuating a rewind mode of operation at a predetermined film tension condition. 
     The selectively actuated rewind control arrangement includes a controller conditioner mechanism that is responsive to film tension and effective to position the controller from a predetermined projector operating mode such as a normal forward mode to a predetermined operating mode such as still when the predetermined film tension condition is sensed. A rewind mode actuator mechanism responsive to the controller conditioner mechanism is provided to control the film transporting drive in the rewind mode upon the operation of the controller conditioner mechanism. 
     The rewind mode actuator mechanism in one arrangement includes a translating member for converting a linear displacement of the controller conditioning mechanism to a rotational movement which is connected to rotate a coupling rod carrying a displacing actuator. The displacing actuator displaces a reverse drive actuator in the film transporting assembly to condition it in a rewind mode.

RELATED APPLICATIONS

The following U.S. patents and applications are related to thisapplication and are assigned to the assignee of the present application:U.S. Pat. No. 4,097,132, filed Feb. 18, 1977, issued June 27, 1978; U.S.patent application Ser. No. 770,249, filed Feb. 18, 1977; and U.S.patent application Ser. No. 770,256, filed Feb. 18, 1977.

BACKGROUND AND SUMMARY OF THE INVENTION

The present invention relates generally to motion picture projectors andmore particularly to a control arrangement for selectively actuating arewind mode of operation upon the occurrence of a predetermined filmtension condition.

Motion picture projectors normally include a forward and reverse filmtransporting drive assembly and a controller assembly which is manuallymovable into various positions for selecting corresponding operatingmodes. A motion picture projector of this type is described in U.S. Pat.No. 3,952,969 which issued to J. G. Woodier on Apr. 27, 1976.

During the normal forward projection mode and as the end of the film isreached, it is desirable to automatically cease the film transportingaction and actuate a rewind mode of operation by sensing the occurrenceof a predetermined film tension condition.

While motion picture projectors of the prior art have providedarrangements to cease film transporting and actuate a rewind mode ofoperation that are generally suitable for their intended purpose, thesearrangements are either overly complex, unreliable or are not easilyadaptable to the film drive and control mechanisms of projectorscurrently available. Further, many of the prior arrangements are notdisabled during certain operational modes such as still, pause, fastforward and reverse where either high film tension normally occurs orthe operator may inadvertently actuate the arrangement.

In accordance with the present invention, it is a principal object toprovide an improved arrangement in a projector to automatically ceasefilm transporting when a predetermined film tension condition occurs inpredetermined operating modes and actuate a rewind mode of operation.

It is a further object of the present invention to provide a simplifiedand reliable arrangement to automatically actuate a rewind mode ofoperation in a projector upon the occurrence of a predetermined filmtension condition and wherein the arrangement is conditioned to asensing mode by the mode controller assembly of the projector and whichceases film transporting action by positioning of the mode controllerassembly.

It is another object of the present invention to provide an arrangementto actuate a rewind mode of operation of a projector upon the occurrenceof a predetermined film tension condition that includes a lockingarrangement to inhibit operation in certain predetermined operationalmodes.

It is a still further object of the present invention to provide anautomatic rewind arrangement in a projector that positions a modecontroller assembly to a position where film transporting is deactuatedand directly effects conditiong of a film transporting drive assembly ofthe projector.

It is yet another object of the present invention to provide anautomatic rewind arrangement in a projector when a high tension filmcondition is detected that is easily adaptable to projector apparatusand avoids one or more of the above-described disadvantages of the priorart arrangements.

These and other objects of the present invention are efficientlyachieved by providing a control arrangement to selectively actuate arewind mode of operation upon the occurrence of a predetermined filmtension condition in a projector provided with a forward and reversefilm transporting drive assembly, an assembly for sensing apredetermined film tension condition and a manually moveable modecontroller assembly for selecting various operational modes.

The selectively actuated rewind control arrangement includes acontroller assembly conditioner mechanism that is responsive to thetension sensing assembly and effective to position the controllerassembly from a first predetermined projector operating mode such as anormal forward mode to a second predetermined operating mode such as astill mode when the predetermined film tension condition is sensed. Arewind mode actuator mechanism responsive to the controller assemblyconditioner mechanism is provided to control the film transporting driveassembly in the rewind mode upon the operation of the controllerassembly conditioner mechanism.

The rewind mode actuator mechanism in one arrangement includes atranslating member for converting a linear displacement of thecontroller assembly conditioning mechanism to a rotational movementwhich is connected to rotate a coupling rod member carrying a displacingactuator member. The displacing actuator member is arranged to displacea reverse drive assembly member actuator in the film transportingassembly to condition the film transporting assembly in a rewind mode.

In a second arrangement, a pivotable link converts the lineardisplacement of the controller assembly conditioning mechanism to avertical displacement of a connecting rod that is coupled through aconnecting pivot plate to pivot a reverse drive actuator member todisplace the reverse drive assembly actuator.

The rewind mode actuator is also provided with actuator members todeactuate a gate and side tension mechanism of the projector in therewind modes and to deactuate a shuttle mechanism.

BRIEF DESCRIPTION OF THE DRAWINGS

The invention, both as to its organization and method of operation,together with further objects and advantages thereof will best beunderstood by reference to the following detailed description taken inconnection with the accompanying drawings wherein:

FIG. 1 is a front perspective view of a molded housing of a motionpicture projector constructed in accordance with the principles of thepresent invention;

FIG. 2 is a rear perspective view of the molded housing of the motionpicture projector of FIG. 1;

FIG. 3 is a sectional view taken along line 3--3 of FIG. 1;

FIGS. 4 and 5 are sectional views taken along lines 4--4 and 5--5respectively of FIG. 2;

FIGS. 6 and 7 are sectional views taken along lines 6--6 and 7--7respectively of FIG. 1;

FIG. 8 is an enlarged front elevational view of a portion of theprojector housing taken from the line 8--8 of FIG. 1;

FIG. 9 is a top plan view taken from line 9--9 of FIG. 8;

FIGS. 10, 11 and 12 are sectional views taken along lines 10--10, 11--11and 12--12 respectively of FIG. 1;

FIG. 13 is a pictorial schematic representation of a motion pictureprojector constructed in accordance with the principles of the presentinvention;

FIG. 14 is a rear elevational view of a motion picture projectorconstructed in accordance with the principles of the present invention;

FIG. 15 is an enlarged fragmentary perspective view of the motionpicture projector of FIG. 14;

FIG. 16 is a fragmentary side elevational view of the motion pictureprojector of FIG. 15;

FIG. 17 is a fragmentary perspective view of an alternative arrangementof the motion picture projector of FIG. 14 with certain parts omittedand parts broken away for clarity;

FIG. 18 is a fragmentary perspective view of the motion pictureprojector of FIG. 14 similar to FIG. 17 and illustrating furtherfeatures of the present invention;

FIG. 19 is an enlarged perspective view of a pusher block element ofFIG. 18;

FIG. 20 is a fragmentary perspective view of portions of the motionpicture projector of FIG. 14 illustrating features in the areas of thedrive, control, and brake assemblies of the present invention;

FIG. 21 is an enlarged elevational view of portions of the motionpicture projector assemblies of FIG. 20;

FIG. 22 is an enlarged elevational view of portions of the motionpicture projector assemblies of FIG. 20 illustrating important featuresof the brake and dual clutch drive assemblies of the present invention;

FIG. 23 is a sectional view taken along line 23--23 of FIG. 22 andillustrating features and details of the clutch and brake assemblies ofthe present invention;

FIG. 24 is a sectional view taken along line 24--24 of FIG. 22 andillustrating further details and features of the brake and clutchassemblies;

FIG. 25 is a view partly in section taken along and from line 25--25 ofFIG. 22 and illustrating further details and features of the brakeassembly of the present invention;

FIG. 26 is a perspective view of a motion picture projectorincorporating further important aspects of the present invention withparts removed and broken away for clarity and illustrating alternatearrangements of certain assemblies of FIGS. 14 through 25;

FIG. 27 is an elevational view of portions of the motion pictureprojector of FIG. 26 illustrating features of the brake and dual clutchdrive assemblies of the present invention;

FIG. 28 is a perspective view of portions of the motion pictureprojector of FIG. 26 illustrating further features of the brake and dualclutch drive assemblies; and

FIG. 29 is a perspective view of portions of the motion pictureprojector of FIG. 26 illustrating features of the brake, control anddual clutch drive assemblies of the present invention.

DESCRIPTION OF THE PREFERRED EMBODIMENT

Referring now to the drawings and particularly to FIGS. 13 and 14, afilm or web handling apparatus such as a motion picture projector 10 hasa path along which an elongated web or film 12, is transported between asupply device 14 and a take-up device 16. The supply device 14 is aconventional cartridge (not shown) or a supply reel and the take-updevice 16 is a conventional take-up reel. The film movement path passesover a film tension sensor 18 and through a transducing station such asa projection station 20. In the case of a motion picture projector, theprojection station 20 includes a projection lamp 22, a projection lens24, and a gate 26 at which an intermittent film transporting mechanismor shuttle 28 is arranged. As best seen in FIG. 14, a shutter 30 isarranged to be rotated in synchronism with the movement of the shuttle28 when powered by the prime mover of the projector.

The prime mover for driven components of the projector is anelectrically energized motor 32 which is mounted in the housing or frame36 of the projector 10 and includes an output drive shaft 38. A pulley40 is fixed to an end of the drive shaft 38 of the motor 32 and a belt42 is arranged to drive a cooperating pulley 44 which is fixed to adriven shaft 48. The driven shaft 48 is supported in bearings 50extending from a mechanism support plate 52 of the housing 36 andcarries the shutter 30 and a drive (not shown) for the shuttle 28. Theelongated driven shaft 48 extends from the vicinity of the shuttle 28and the shuttle 30 toward the vicinity of the take-up assembly 16. Afriction driver or snubber 54 is affixed to the driven shaft at the endnear the take-up assembly 16 as best seen in FIGS. 17 and 18. The motor32 is a unidirectional drive device and thus the driver 54 isunidirectionally rotated as well. The drive shaft 38 also extendsthrough the motor 32 opposite the pulley 40 and carries a ventilationdevice such as a fan blade (not shown).

Internally of the projector housing 36, and associated with theoperation of the supply device 14 and the take-up device 16 is a dualclutch drive assembly 60. The components of the dual clutch driveassembly 60 are arranged axially on a shaft 62 for rotation about andlimited movement along the shaft. A take-up spindle 64 is supported onthe outer end of the shaft 62 for releasably receiving the take-updevice 16. A first forward drive subassembly of the dual clutch assembly60 referred to generally at 65 (FIG. 17) is selectively coupled to thespindle 64 such that the take-up device 16 may be in one of threeoperational states; free, frictionally driven (slip), or positivelydriven. Internally of the projector housing 36, the shaft 62 of the dualclutch drive assembly 60 supports a second reverse drive subassemblyreferred to generally at 70 (FIG. 17) which is operable in the samethree conditions or states. The operational state for both subassemblies65 and 70 is determined by the operating mode of the projector 10according to the position of a control lever selector 90, FIGS. 15, 17and 18, as will be explained in more detail hereinafter. A drive shaft72 connects the reverse drive subassembly 70 to the supply device 14.

As seen in FIGS. 13 and 14, the supply assembly 14 in a specificpreferred embodiment includes an externally arranged reel supportingspindle 74 mounted on an arm 78 pivoted about a shaft 80 through which abevel gear pair 82 couples the supply shaft 80 to the drive shaft 72. Asupply spindle drive mechanism (not shown) internal to the arm assembly78 drivingly couples the shaft 80 to the supply spindle 74. The geararrangement 82 enables the spindle 74 to be driven responsive torotation of the reverse drive subassembly 70 in the reverse or rewind(fast reverse) modes and allows the withdrawal of film 12 from thesupply reel 86 in the forward mode of operation. For film transportduring normal forward projection, the reverse drive subassembly 70 ofthe dual clutch drive assembly 60 is not engaged. Thus, the drive shaft72 and the supply spindle 74 are free to be rotated as required forwithdrawal of film from the supply reel 86. The take-up spindle 64 isfrictionally driven in the forward mode to wind up the film beingwithdrawn from the supply assembly 14 by the shuttle 28. The drivecomponents 70, 72, 82 and the supply spindle drive mechanism throughwhich the supply spindle 74 is driven provide a speed reduction and aslight drag to reduce the possibility of film "spillage."

In the reverse projection mode, the reverse drive subassembly 70 isfrictionally coupled to and driven by the dual clutch drive assembly 60in the slip state to cause the supply spindle 74 to be operated in atendency drive condition. The supply reel 86 and the spindle 74 rotateto wind up film as the shuttle 28 pulls film from the take-up reel 16 onwhich the film supply is wound. Correspondingly in the rewind mode, thereverse drive subassembly 70 is positively driven by the dual clutchdrive assembly 60 to operate the supply spindle 74 in a positivelydriven rewind speed condition.

Conditioning of the projector 10 to the several operational modes isobtained through a mode controller assembly referred to generally at 88(FIGS. 17 and 18) and including the control lever selector 90 which isarranged for manual actuation. The controller assembly 88 is describedin more detail in U.S. Pat. No. 3,952,969 to which reference may bemade. The end of the control lever 90 passes through an "H" shaped slot92 in the projector housing 36 thereby permitting the lever 90 to beshifted from a pause mode or a still projection mode at opposite ends ofthe cross bar of the "H" to the ends of the legs of the slot 92. As thelever 90 is shifted in the slot to the ends of different legs thereof,referred to as orientations "a," "b," "c" and "d," (FIG. 13) theprojector 10 is caused to operate in selected operational modes. Asshown in FIGS. 13 and 15, positions "a" and "b" provide respectively fornormal forward and reverse projection modes. Positions "c" and "d"provide respectively for a fast forward mode and a fast reverse orrewind mode which are also commonly referred to as search modes. Thecross bar position between positions "a" and "b" is referred to as thestill projection mode and the cross bar position between the "c" and "d"positions is referred to as the pause mode.

From within the projector housing 36, and as best seen in FIGS. 15through 18 and 20, the control lever 90 is positioned about an axisdefined by a control rod 94 by a combination of pivoting (rotational)and lateral shifting (linear axial) movements. The control lever 90 isfixedly connected to the control rod 94 to prevent simultaneous rotationabout and longitudinal shifting along the rod 94. The rod 94 issupported slidably and pivotally in bearing members 96 fixed to thehousing 36 of the projector.

A safety interlock button 97, best seen in FIG. 16, is provided in aspecific embodiment above the control selector lever 90 and extendingthrough a slot 98 (FIG. 18) in the projector housing 36. The safetyinterlock button 97 when in a first outwardly extended position iseffective to inhibit the selection of the fast forward mode byrestraining the selector lever 90 from being positioned to the "c"orientation. When the safety interlock button 97 is depressed to asecond inward position, the selector lever 90 is then positionable tothe fast forward position.

Axially spaced along the control rod 94 are motion translatingcomponents including a gate and side tension control assembly 100 and aclutch control assembly 102, FIGS. 17 and 18.

The gate and side tension control assembly 100 includes an offset axlestub 106 extending from the housing 36 which pivotably supports a plate108. A stub 110 extends from the plate 108 into a control sleeve 112fixed to the rod 94. As the rod 94 is shifted longitudinally (axially),the sleeve 112 is caused to move axially therewith. As the sleeve 112shifts due to axial movement of the control rod 94, the plate 108 ispivoted about the axis 106. A vertically disposed connecting link 114(FIGS. 17 and 18) of the gate and side tension control mechanism 100 isdisplaced from a first vertical position to a second vertical positionupon the pivoting of the plate 108 by a pin 116 which extends from therotated end of the plate 108 and engages the connecting link 114 in anenlarged slot 118 formed therein. The slot 118 is dimensioned to permitmovement of the link 114 in either of the axially displaced conditionsof the control rod 94 and the control assembly 100 for a purpose to bedescribed hereinafter. The lower position of the connecting link 114causes the gate 26 (FIG. 13) to be closed and side tension to be appliedto the film at the gate 26. The upper position causes the gate to beopen and the side tension to be removed, a condition which is desirablefor the high speed film transport operation in the fast forward mode andthe fast reverse or rewind mode.

Considering the clutch control assembly 102, as the control rod 94shifts longitudinally (as the control lever selector 90 is shiftedlongitudinally between the still and the pause positions across thecenter cross bar of the "H" pattern) a double sided-double track cam 120(FIG. 23) fixed to the rod 94 is shifted selectively to align one of thetwo cam tracks 122 or 124 with cam follower portions 128 and 126respectively which are formed on a reverse drive clutch actuator 132 anda forward drive clutch actuator 130. The reverse drive clutch actuator132 conditions the reverse drive subassembly 70 and the forward driveclutch actuator 130 conditions the forward drive subassembly 65. The cammember 120 in a specific embodiment is fabricated as a unitary elementand fitted over the control rod 94 to be retained thereon. When the rodis in one position, e.g., to the left in FIGS. 17 and 18, the cam track124 is the operating cam, whereas when the rod is to the right, camtrack 122 is the operating cam. As best seen in FIG. 23, the clutchactuators 130, 132 are mounted for pivotable movement about an axisthrough a stub shaft 134 fixed on the housing 36 by a support platform135. As each actuator is displaced pivotably in response to rotation ofthe dual cam member 120, the drive subassemblies 65 and 70 of the dualclutch drive assembly 60 are shifted from a first operational state toanother operational state to selectively transmit power from thefriction driver input 54. A fork end 136, 138 of the respectiveactuators 130, 132 causes displacement of portions of the clutchassembly as the fork end 136 or 138 is caused to engage a respectiveclutch member responsive to the orientation of the dual track cam member120.

In each of the substantially identical drive subassemblies 65 and 70 ofthe dual clutch drive assembly 60, (FIG. 23) a drive disc 150 issupported on the spindle shaft 62 for substantially free relativerotation. Near the periphery on one surface of the drive disc 150 isformed a slightly raised rim 152 for engaging the friction driver 54 onthe driven shaft 48. Extending axially from the opposite surface of thedrive disc 150 is formed a rim 154 relative to which a ring of frictionmaterial 156 is arranged. About the shaft 62, the disc has an extendedhub portion 158 for maintaining alignment of the drive disc 150 duringaxial sliding movement along the shaft.

Cooperating with the drive disc 150 and particularly with the frictionring 156 is a clutch plate 160. The clutch plate 160 is provided with anannular recess 162 proximate the perimeter on one surface for engagingthe friction ring 156 along the surface opposite the drive disc 150.About the shaft 62, the clutch plate 160 has an offset portion 164 whichrides on the extended hub 158 of the drive disc 150 and can be rotatedeither therewith or relative thereto. Approximately midway of the radialextent of the surface of the clutch plate 160, a series of holes 166 areformed for coupling of a driven disc 170.

The driven disc 170 is formed with a number of legs 172 extendingperpendicularly from one surface thereof. The number of legs and thearrangement thereof is selected to cooperate with the holes 166 of theclutch plate 160. Along most of their length, the legs 172 aredimensioned to fit snuggly but slidably in the holes 166. For a shortlength 173 from the remote end of the legs 172, the legs are reducedslightly in diameter to fit into one of several receiver slots 174formed in the adjacent surface of the drive disc 150. The slots 174 areformed by the space between a plurality of ribs 176 arranged on thesurface of the drive disc 150 to be engaged by the legs 172. Afterassembly of the above described parts, a washer 177 is frictionallyfitted on each of the legs 172 to limit relative axial movement betweenthe driven disc 170 and the clutch plate 160 and ensure engagement ofthe legs 172 with the clutch plate 160.

The driven disc 170 of the forward drive subassembly 65 is provided witha hub 180 which is dimensioned to rotate freely of the shaft 62. In theend of the hub 180, a slot 182 is provided for cooperating with a matingkey member 184 extending from the take-up spindle 64. The oppositedriven disc 170 of the reverse drive subassembly 70 is provided with asemicircular slotted split hub portion 185 which is also dimensioned torotate freely of the shaft 62 and cooperates with a mating sleeve 186which extends from one gear 187 of a bevel gear pair 188. The secondbevel gear 189 of the gear pair 188 is connected to the drive shaft 72.

Thus when assembled, the driven disc 170 is positively and continuouslycoupled to the drive shaft 72 and the supply spindle 86 whether or notthe disc 170 is in a driven state. The driven disc 170 is onlypositively driven when the legs 172 engage the slots 174 in the drivedisc 150. A coil spring 179 is arranged about the hub 158 of the drivedisc 150 for urging or biasing the driven disc 170 away from the clutchplate 60. Consequently, the legs 172 are also normally urged away fromthe drive disc 150.

In operation, when one of the clutch actuators 130, 132 is displacedfrom a first condition to a second condition, the clutch plate 160 isshifted axially overcoming the force of the spring 179 and approachingthe drive disc 150. In a condition of partial displacement of the drivendisc 170 toward the drive disc 150, as in the forward drive assembly 65in FIG. 23, the clutch plate 160 is urged with a slight pressure towardthe drive disc 150. However, the legs 172 are not moved into engagementin the slots 174 of the drive disc 150 although the spring 179 causesdrive transmission through the friction disc 156. In this condition, thedrive from the driven shaft 48 causes the clutch plate 160 to betendency driven but permits slippage to occur if the take-up spindle 64is slightly restrained. This condition is employed when the projector isin the normal forward projection mode with the forward drive clutchactuator 130 tilted or pivotally displaced a relatively small amount bythe cam surface with which it is engaged.

Referring to FIG. 23, the cam tracks 122, 124 have three levels, forexample, 122a, 122b, 122c which are each respectively engaged by the camfollower 126, 128 as determined by the orientation of the cam member120. The level 122c is the high level causing positive drive of thereverse drive clutch subassembly 70 as shown by the displacement of thereverse cam follower 128 of the reverse drive clutch actuator 132 to theleft in FIG. 23. The level 122a is the low level condition in which theclutch is not actuated but remains free. When the level 122b displacesthe cam follower 128, the middle position, the driven disc 170 is in thetendency or slip condition discussed hereinabove.

Thus, the orientation "c" fast forward, pause, and "d" fast reverse ofthe control selector lever 90 correspond respectively to the campositions 122a, 122b and 122c for the reverse cam follower 126. The camtrack 124 is arranged to displace the reverse cam follower 128 to thetendency or slip condition when the control selector lever 90 is in the"b" position and to the free condition when the control selector is inthe still or "a" position. Similarly, the cam track 124 is arranged todisplace the forward cam follower 126 to the tendency or slip conditionwhen the control selector lever 90 is in the "a" position and to thefree condition in the still and "b" positions.

Summarizing the condition of the dual clutch drive assembly 60 in thevarious projector operational modes, for forward projection, controlselector orientation "a," the forward cam follower 126 is displaced toselect a tendency (slip) drive condition for the take-up spindle 64while the reverse cam follower 128 permits a free drive condition forthe supply spindle 74. In the reverse projection mode, the supplyspindle 74 is in a tendency or slip drive condition and the take-upspindle 64 is in a free condition. The take-up spindle 64 is positivelydriven in the fast forward mode and the supply spindle 74 is free, whilefor the rewind mode, the supply spindle 74 is positively driven and thetake-up spindle is free. As the control selector lever 90 passes throughthe pause position, the tendency drive condition is established for boththe supply and take-up spindles. Reference may be made to U.S. Pat. No.3,952,969 referred to hereinbefore for a more detailed description ofthe dual clutch drive assembly 60.

In accordance with an important aspect of the present invention andreferring to FIGS. 20 through 25, a brake assembly 195 best seen in FIG.22 is provided in a specific embodiment to prevent film spillage and tostabilize the dual clutch drive assembly 60. The brake assembly 195 iscontrolled by a brake cam arrangement 197 carried by the control rod 94.The brake assembly 195 includes a double brake shoe arrangement 199, 201which engages the rim portions of the clutch plates 160 when the controlselector 90 is moved from either the fast forward "c" position or thefast reverse "d" position into the pause position at the center of the"H" pattern between the "c" and "d" positions. The double brake shoearrangement 199, 201 also engages the rim portion of the clutch plates160 when the control lever selector 90 is moved from the still centerslot position of the "H" pattern to the pause position. In an alternateembodiment the brake arrangement is actuated only when the control leverselector is moved from the still to pause positions.

In accordance with further important aspects of the present invention,the brake cam arrangement 197 includes a cam member 203 extendingupwardly from a cam body member 205 which is fixed to the control rod 94so as to pivot and rotate with the rod 94. The cam member 203 isdisposed in an operative contact position with a pivoted cam followerdisc 207 when the control rod 94 is positioned in the right laterallyshifted position corresponding to the pause position of the controlselector 90. The cam follower disc 207 includes an extending followerarm 209 that is contacted by the cam member 203. A spring 211 is coiledabout a pivot pin 213 of the cam follower disc 207 and applies force toan extending pin 215 of a lower arm 217 of the brake assembly 195 thatis pivoted about a pivot pin 219. Rotation of the lower arm 217 alsorotates an upper arm 221 of the brake assembly 195 that carries thedouble brake shoe arrangement 199, 201. The upper arm 221 is biased inthe "off" brake position of the brake shoes 199, 201 by a spring 223extending between the upper brake arm 221 and a mounting plate attachedto the housing 36.

In operation, when the cam member 203 pivots the cam follower arm 209,disc 207 and arms 217 and 221, the double brake shoe arrangement 199,201 is engaged to rapidly slow operation of the rotating clutch plates160 corresponding to either the fast forward or the rewind mode. Thisbraking action takes place as the control selector 90 and the controlrod 94 rotate from either the fast forward or rewind position to thepause position. In accordance with important aspects of the presentinvention, the braking action prevents film spillage and promotesstabilization during rapid mode selection when operating the projectorin the search modes, the fast forward and rewind (fast reverse) modes.

The mode controller assembly 88 is arranged to translate the movementsof the control lever 90 within the "H" slot to operational movements ofcomponents of the projector 10. The control assembly 88 is pivotally andaxially movable about the axis through control rod 94. As best seen inFIGS. 15 and 20, the control lever 90 is an extension of a U-shapedframe 190 fixed to the control rod 94.

A shuttle retractor and reversal mechanism actuator 194 as best seen inFIGS. 15 and 20, is positioned for operation adjacent the frame 190.Extending radially from the actuator 194 is a bar member 196 from whichextends a pin 198 and a shuttle retractor engaging foot portion 200. Anarm 204 of the U-shaped frame 190 opposite the lever arm portion 90 isprovided with a pin receiving aperture through which the pin 198 can bepassed. When the pin 198 is inserted into the arm 204, the frame 190 andthe actuator 194 are coupled for pivotal movement. This combinedpivoting action of 190 and 194 occurs only when the mode controller 88is in the normal projection modes, forward and reverse, represented bypositions "a" and "b." As the actuator 194 pivots, the foot portion 200is removed from engagement with a rounded portion of a shuttle retractoractuator link 206. The control rod 94 passes through a hole in theactuator 194 which is dimensioned so the rod 94 rotates freely of theactuator 194. The actuator 194 is positioned and supported at the lowerend between housing portions 191 and 193 by the rod 94 and at the upperend between a housing portion 192 and a shuttle reversal sleeve 210.

When the controller 88 is shifted axially from the pin engaged conditionof the actuator 194, the pin receiving arm 204 is moved away from thepin 198 of the actuator. In this condition, for the pause, fast forwardand fast reverse modes, the frame 190 is pivotable independently of theactuator 194. That is, the shuttle retractor engaging foot portion 200is not removed from alignment with the retractor link 206 therebymaintaining the shuttle assembly 28 retracted and inoperative as will beexplained in detail hereinafter.

An elongated shuttle retractor link 312 (FIG. 18) is connected at oneend to the shuttle retractor actuator 206 and extends to the vicinity ofa release arm 240. The shuttle retractor actuator 206 is rotatablycarried by a pin 202 extending from a housing stud 224. As the shuttleretractor actuator 206 rotates about pin 202, the shuttle retractor linkis displaced vertically. The retractor link 312 is guided for movementby a pin 314 extending through a slot 316 formed in the retractor link312. The retractor link 312 includes an extending cam arm 317 in thevicinity of the slot 316 to engage along its bottom edge an extendingpin 320 of a shuttle retractor mechanism 322. The shuttle retractormechanism arm 322 is pivotally biased to an upper position and iseffective to retract the shuttle mechanism 28 and position a fireshutter (not shown) over the projector aperture at the projectionstation 20 when the mechanism arm 322 is moved to the lower position bycamming arm 317 in response to movement of the retractor actuator 206.The shuttle 28 is in an operable position and the fire shutter isretracted when the arm 322 is in its upper position. The retractor link312 further includes a foot 318 positioned at the top end of theretractor link 312 which engages a release locking assembly as will beexplained in more detail hereinafter.

Adjacent the frame 190, generally parallel to the control rod 94 andextending from the housing 36, is a shaft 208 on which a shuttlereversal sleeve 210 is fixedly mounted. The shaft 208 is slidablysupported in a bearing 37 carried by a housing extension 226 and amechanism support plate 39. A plate 212 extends from the sleeve 210 andcarries a cam follower 214. The cam follower 214 engages a cam track 216which is formed on a wing portion 218 extending from the actuator 194.The shaft 208 and affixed sleeve 210 are caused to move by engagement ofthe cam follower 214 against the cam surface 216. The actuator 194including the foot portion 200, the wing portion 218, and the camsurface 216 are restrained against axial movement. As the "U" frame 190is pivoted for example to the reverse or "b" position, the high point ofthe cam track 216 is similarly pivoted causing the sleeve 210 and theshaft 208 to be displaced axially to the right in FIG. 14. The plate 212is precluded from pivotal movement by being positioned between a pair offixed guide posts 222 extending from the housing 36. Thus, when the highportion of the cam section 216 is aligned with the cam follower 214, thesleeve 210 is caused to move axially thereby displacing an associatedshuttle reversal control generally referred to at 220 from a firstforward condition to a second reverse condition. Upon return of the lowcam section of the cam surface 216 to a position of cam followerengagement, a spring 223 positioned about the reversal control 220 urgesthe sleeve 210 toward the position as shown in FIG. 14.

Referring now to FIGS. 13, 15 and 18 and in accordance with furtherimportant aspects of the present invention, an automatic stoppingfeature, auto-stop, is actuated in response to tension in the film 12along the film path and an additional automatic rewind feature,auto-rewind is actuated in response and further to the auto-stopcondition in a specific embodiment. The trailing end of the film isattached to the hub 74 of the supply reel 86 so that at the end of aforward projection sequence, the end of the film is not pulled from thehub by the continued action of the shuttle 28 in the forward mode. Alongthe upper portion of the film path, intermediate the shuttle 28 and thesupply reel 14, the film 12 passes over the film tension sensor 18causing a roller 230 supported yieldably on a pivotally mounted springwire 232 to be displaced according to the tension in the film. Duringthe forward projection sequence, the roller 230 moves lightlyup-and-down as the shuttle intermittently engages the film and pulls apredetermined length of film from the supply reel 86. However, as thetension in the film increases at the end of a projection sequence to apredetermined tension condition, the roller 230 is rotated or displaceddownwardly a sufficient amount to actuate the sequence to cease filmtransporting.

The spring wire 232 supporting the roller 230 passes across a cradle 234formed on an arm 236 extending from a release arm 240 which is mountedpivotably about a pin or shaft 242 that is fixed to a housing portion.The release arm 240 is provided with a release finger portion 244located below the pivot point 242 and opposite the cradle arm 236. Therelease arm 240 is also provided with two additional fingers 246 and 248arranged on the right side of the pivot pin 242 along a downwardlyextending portion of the release arm 240. The higher positioned finger246 of the two lower fingers provides a guiding surface for adisplaceable pusher block 254 as it moves within a receiver slot 256formed in the housing 36. Depending upon the position of the block 254,the lower finger 248 of the release arm 240 is either free of engagementwith the block thereby permitting pivotable movement of the release arm240 or engages the block to prevent movement of the arm 240 as will beexplained in more detail hereinafter. A spring 258 is connected betweenthe release arm 240 and a pin 259 extending from the housing 36 to urgeor bias the release arm 240 in a counterclockwise direction. The pusherblock 254 (FIG. 19) also includes a circular spring receiver depression260 in the top surface of the block 254 to receive a coil spring 261positioned between the block and the top surface of the housing to urgethe block 254 in a downward direction. A rod receiver plate 262 extendsfrom the pusher block 254 and includes an elongated slot.

An elongated trip arm 266 cooperates with the release arm 240 and thecontrol lever 90 for stopping the operation of the projector 10 duringthe normal forward projection mode of operation upon the occurrence of apredetermined film tension condition. The trip arm 266 (FIG. 15) isprovided with an elongated slot 268 in which is arranged an extendingsupport plate 269 of the housing for guiding the trip arm 266 uponlongitudinal vertical movement. The trip arm 266 is held against thesupport plate 269 by a washer 274 and a screw 276 threaded into thesupport plate 269. The trip arm 266 is capable of movement from onevertical limit to another restricted by the support plate 269 and thescrew 276. At the upper end of the trip arm 266, an offset ledge 278 isprovided for engagement with the finger 244 of the release arm 240 whenthe trip arm 266 is moved into a raised reset position. The trip arm 266is moved vertically by the engagement of a foot portion 294 (FIGS. 17and 18) against the controller handle arm 90 of the U-shaped frame 190upon rotation of the frame 190. The trip arm 266 also is provided with arectangular slot 280 below the slot 268 through which a lug 282 extendsfrom the housing 36. A tab 286 extends from the lower edge of the slot280 and serves as a restrainer for maintaining a spring 288 coiledtherein between the bottom edge of the slot and the bottom of the lug282. The spring 288 is arranged to bias the trip arm 266 downwardly froma first reset position shown in phantom in FIG. 16 to a second, trippedor release position as shown in FIG. 16.

An elongated lockout member 296 (FIG. 15) passes through a third slottedportion 290 located in the trip arm 266 above the foot portion 294. In aspecific embodiment, provided at a predetermined position along thelength of the lockout member 296 are a pair of tabs 298 (FIG. 18) and awidened limit wing portion 302 (FIG. 15). The slotted portion 290 of thetrip arm 266 is dimensioned to a first width 290a throughout the lowerportion which is comparable to the width of the lockout member 296 andto a second width 290b throughout the upper portion which is comparableto the width of the limit wing portion 302 of the lockout member 296. Aspring 304 (FIG. 16) disposed along the lockout member 296 between thetab 298 and the limit wing 302 urges or biases the lockout member 296outwardly or externally.

The external end of the lockout member 296 is provided with a safetyinterlock control button 97 (FIG. 16) by which the lockout member 296may be displaced from a first external position to a second internalposition. The internal end of the lockout member 296 receives across-pin 308 (FIG. 15) which is fixed at one end in a collar 309 whichis mounted about the shaft 208 for rotation and from which a tongueportion 310 extends.

An elongated tie rod 330 is connected between the collar 309 and the rodreceiving plate 262 that extends from the displaceable pusher block 254.Upon rotation of the collar 309 and tongue 310 in response to movementof the interlock button 97, the displaceable pusher block 254 is raisedfrom a lower position to an upper reset position. When the interlockbutton 97 is depressed corresponding to the lockout member 296 moving tothe internal position, the control selector 90 is capable of beingrotated upwardly since the narrower width portion of the lockout member296 is now aligned with the slot 290. When the safety interlock button97 is in the external undepressed position, the control selector 90 isprevented from being rotated to either of the upward positions, forward"a" position, or fast forward "c" position since the wider limit wingportion 302 is aligned with the slot 290 which is narrower at portion290a than the limit wing 302.

In accordance with yet further important aspects of the presentinvention and when the pusher block 254 is raised to the upper positionin reponse to operation of the interlock button 97, the release arm 240is free to pivot about the pivot axis 242 in a clockwise directioneither in response to tension in the film 12 upon the roller 230 andcradle 234 or upon the raising of the trip arm 266 to the resetposition.

As the control lever 90 is lifted from the "still" orientation to theforward "a" position, simultaneously with the depression of the safetyinterlock button 97 the frame 190 engages the foot 294 of the trip arm266. The trip arm 266 is thereby moved upwardly until the offset ledge278 is clear of the finger 244 of the release plate 240. As the outerinclined portion 279 of the offset ledge 278 rises, the release arm 240is pivoted temporarily in a clockwise direction (as shown in FIG. 15)until the finger 244 is cleared. Thereafter, the finger 244 of therelease arm 240 returns to the trip arm retaining position to establisha reset position. When the interlock button 97 is released, the lockoutmember 296 returns partially to the external position which releases thepusher block 254 to move downward to the position contacting the foot318 of the shuttle retractor link 312 for a purpose to be explained indetail hereinafter. The dimensions of the slot in the rod receiver plate262 allow for the return movement of the rod 330, collar 309 and thelockout member 296.

Briefly, upon the spring wire 232 being rotated in response to apredetermined film tension condition, the release arm 240 is pivotedaway from the trip arm 266 allowing the trip arm to move to its lower ortripped position. Hence, the projector 10 is in a reset mode forautomatic stopping on the next occasion that the predetermined filmtension condition occurs during forward or reverse film transport aswill be explained in detail hereinafter.

In accordance with a further important aspect of the present invention,the tension sensor assembly 18 is prevented or locked out from actuatingthe auto-stop operation after the reset mode has been achieved exceptwhen the projector control selector 90 is in either the normal forwardor reverse modes "a" and "b" respectively. This is accomplished bypreventing or inhibiting any rotation of the release arm 240 in anyother mode or position of the control selector 90 in response tomovement of the roller 230 and pressure on the cradle 234.

More specifically, if the control selector is in the forward or reversemodes, the shuttle retractor link 312 is in the upper position whereinfoot 318 biases the pusher block 254 in the upper position to freefinger 248 and allow rotation of the release arm 240. However, if thecontrol selector is in any other mode, the shuttle retractor foot 318 isin the lower position and rotation of the release arm 240 is preventedthereby inhibiting an auto-stop function even though the trip arm 266 isin the reset position. Thus, in the still, pause, fast forward and fastreverse positions, the auto-stop mode is not operational.

In an alternative embodiment and/or where a safety interlock arrangementis not provided, referring to FIG. 17, the pusher block 254 isconditioned for movement solely by the foot 318 of the shuttle retractorlink 312. Thus, the lockout of the auto-stop function is obtained in thesame manner as in the arrangement of FIGS. 14, 15 and 18 but the pusherblock 254 is provided only with the locking finger 248 and the rodreceiver plate 262 is omitted. Similarly, if no interlock device isutilized, the interlock button 97, lockout member 296, collar 309 andthe connecting rod 330 are also omitted. In operation, the trip arm 266is positioned to the reset position and the foot 318 cooperates toposition the pusher block 254 as discussed hereinabove. However, thetrip arm 266 and the release arm 240 as well as the pusher block 254 andthe foot 318 are positioned relatively so that the foot 318 raises thepusher block 254 to the position to allow pivoting of the release arm240 before the trip arm 266 moves into the reset position. This allowsfor the necessary pivoting of the finger 244 and release arm 240 beforethe offset ledge 278 of the trip arm 266 contacts the release arm.

In another specific alternative embodiment, the lockout member 296 andthe slot 290 of the trip arm 266 are dimensioned and cooperate toprovide the safety interlock function and the displaceable pusher block254 being in the downward position restrains the control selector 90from being positioned to the forward "a" and fast forward "c" positions.This is accomplished by the finger 248 restraining pivotal movement ofthe release arm 240 thereby preventing the trip arm 266 from beingraised to the reset position until the block 254 is raised by actuationof the safety interlock button 97 to allow the necessary pivoting. Thus,the lockout member 296 is not provided with the limit wing portion 302or the tabs 298. Instead, the lockout member 296 may be provided with adeformable strip positioned on an underlying strip. The lockout memberincludes an extending tab along the length of the deformable strip whichexpands after passing through the slot 290 to retain the lockout member296 in the internal actuated position until the trip arm 266 is raisedto the reset position whereupon an enlarged lower portion of the slot290 allows the lockout member 296 to return to the external position.

In accordance with several important aspects of the present invention,the various assemblies and subassemblies described hereinabove functionindependently and cooperatively to provide the projector 10 with anauto-stop mode. Further and in accordance with other important aspectsof the present invention, the projector can be arranged in a specificembodiment to automatically rewind the film, auto-rewind mode, inresponse to and further to the auto-stop condition. Briefly, when theprojector 10 is being operated in the normal forward projection mode"a," the automatic stopping mechanism is set to respond to tension inthe film whereby the tension sensor 18 is actuated to cause theprojector to be placed in the still projection mode. Thereafter, theprojector can be automatically shifted to the auto-rewind mode if theprojector is equipped with such a mechanism. Although the anticipateduse will be complete the rewind of the full length of film, the operatormay interrupt this sequence by depression of the safety interlock button97 whereupon the control lever 90 may be positioned to other operatingmodes.

To initiate the threading of film through the film path of theprojector, the operator displaces the mode selector to the forwardproject position "a." In this operational mode, the mechanisms arearranged substantially as shown in FIG. 18. Specifically, the trip arm266 is lifted and engages the release arm 240. Further, the tensionsensor 18 is in an operational sensing mode and is displaced to anactuating high film tension condition when the end of a film is reachedand no additional film is available to be withdrawn from the supply reel86. As the film becomes taut, the release arm 240 is pivoted about thepivot point 242. As the movement of the release arm 240 occurs, thefinger 244 moves clear of the offset ledge 278 on the trip arm 266. Thespring 288 then biases the trip arm 266 downwardly causing severalfunctional actuations to be initiated and/or completed.

With the downward movement of the trip lever 266, the foot 294 displacesthe control lever 90 and the frame 190 from the forward project mode tothe still project mode as suggested in FIG. 16. Due to the movement ofthe control lever 90, the control rod 94 and the frame 190, the forwardtake-up drive assembly 65 is deactuated through the dual clutch driveassembly 60. Simultaneously, the shuttle retractor link 312 isdeactuated through actuator 206 as the control rod 94 rotates. If theprojector is equipped with a safety interlock device, the lockout member266 returns to the fully returned external position.

Thus, film transporting action of the projector mechanisms ceases or isstopped with the control selector 90 positioned in the still position.After projector operation has stopped, the operator has a selection ofthe operational mode to which the projector is to be actuated. Since nofilm is available for forward film transport, it is not advisable toselect a forward projection mode and thus the projector can be set foreither normal reverse projection or more likely the rewind (fastreverse) mode. That is, the control lever 90 can be shifted to eitherorientation "b" or "d." The control lever 90 as discussed hereinabovemay also be positioned to the "c" fast forward position upon theactuation of the safety interlock button 97, but this position, ofcourse, is not recommended. Assuming the operator cares to review thefilm at normal frame rate speed, the lever is shifted to the "b"position. Through the control rod 94 and clutch control assembly 102,the dual clutch drive assembly 60 and reverse drive subassembly 70 isactuated to drive the supply reel 86 to function as a film take-up reel.When the trip arm 266 caused the control lever 90 to be lowered, thecontrol lever 90 through rotation of control rod 94 and actuator link206 caused the shuttle 28 to be retracted and the fire shutter (notshown) to be introduced in the projection aperture 20 as though theprojector had been manually conditioned for still projection. As thecontrol lever 90 is moved to orientation "b" for reverse projection, thefire shutter is withdrawn and the shuttle 28 is permitted to engage thefilm for further film movement in the reverse direction. The trip arm266 and the release arm 240 remain in the tripped condition until theprojector is again conditioned for forward projection whereupon it againis placed in the reset mode and the tension sensor 18 is operable toactuate an auto-stop function when the control lever 90 is in theforward or reverse modes, positions "a" and "b" respectively.

After the projector has been automatically conditioned to the stillmode, the operator most likely will elect to rewind the film through theprojector to prepare for projection of another film. Thus, the controllever 90 is displaced to the rewind (fast reverse) orientation "d."Through the control rod 94 and clutch control assembly 102, the dualclutch drive assembly 60 and reverse drive subassembly 70 in thepositively driven state causes driving of the film rapidly onto thesupply reel 14. The trip arm 266 remains tripped, the gate and tensionconnecting actuator link 114 remains deactivated and the shuttleretractor link 312 is actuated to retract the shuttle 28 and positionthe fire shutter in the projection aperture.

Following reverse projection or rewind of the film, the projector isconditioned for forward film transport. As the control lever 90 islifted from the "still" orientation to the "a" position (with actuationof the safety interlock mechanism if so equipped), the trip arm 266 israised and set to the upper reset position and retained by the releasearm 240. Hence, the projector is again conditioned for auto-stop on thenext occasion that the predetermined film tensioncondition occurs duringforward or reverse film transport.

In accordance with another important aspect of the present invention andin a specific embodiment, the projector 10 is provided with actuatingmechanisms to automatically accomplish rewinding of the film referred toas an auto-rewind function, upon the occurrence of a predetermined filmtension condition. To accomplish the auto-rewind function and referringnow to FIGS. 14, 15 and 18, an auto-rewind actuator assembly 350 isprovided including an elongated link 352 which is pivotably mountedabout a stub shaft axis 354 fixed to the housing 36. One end of theactuator link 352 is connected by a pivot pin at 356 to the trip arm 266to pivot the link 352 in a counterclockwise direction about the axis 354corresponding to the trip action of the trip arm 266. At the oppositeend of the elongated actuator link 352, a spring 358 is connectedbetween the link 352 and a pin 360 extending from the housing 36 to biasthe link 352 in a counterclockwise direction about the axis 354. Anelongated wire or rod 362 connects the link 352 to a linking plate 364which is pinned to and operates an auto-rewind clutch actuator lever366. The linking plate 364 is positioned at the end connected to the rod362 between two vertical ridges 365 extending from the housing 36 toform a guide channel. As the link 352 rotates in a counterclockwisedirection, the plate 364 moves upward against the housing 36 in theguide channel formed by ridges 365 thereby moving the pivot pin end ofthe plate 364 connected to the clutch actuator lever 366 in an outwarddirection from the housing.

The clutch actuator lever 366 is pivotable about an axis pin 368extending from a plate 370 carried by the clutch assembly support plate52. The clutch actuator lever 366 is pivoted about the axis pin 368 toactuate the reverse drive subassembly 70 by displacing the clutchactuator 132 upon rotation of the auto-rewind link 352. As the clutchactuator link 366 rotates at the end connected to the plate member 364in an outward direction about pin 368, the opposite end of the clutchactuator lever 366 provided with an extending actuator 367 rotatesinwardly against the clutch actuator 132. Thus upon the trip arm 266moving downward after a predetermined film tension condition in theforward or reverse modes in a specific embodiment, link 352 is rotatedin a counterclockwise direction to actuate the reverse drive subassembly70 in the positively driven condition to achieve fast reverse operationalthough the control lever selector 90 is in the still position as inthe auto-stop sequence.

The auto-rewind mechanism also deactuates the gate and side tensioncontrol actuator link 114. A gate and side tension connecting rod 370(FIG. 18) is provided and connected between the trip arm 266 and a pivotlink 372 mounted near the control rod 94 about a pivot pin 374 andadjacent an extending tab 376 of the gate and side tension control link114. The pivot link 372 is connected to the rod 370 at one end from thecentrally located pivot point 374 and includes an extending pin 378 atthe opposite end to engage and lift the link 114 by means of theengaging tab 376 thus deactivating the gate and side tension mechanism.

To prevent actuation of the shuttle mechanism 28 when the controlselector 90 is positioned in the reverse "b" position and the projectoris equipped with an auto-rewind mechanism, the auto-rewind link 352 isprovided with a downwardly extending foot 380 to engage a tab 382extending from the shuttle retractor link 312. When the shuttleretractor actuator 206 rotates and the shuttle retractor link 312attempts to move upward, foot 380 contacts tab 382 thereby preventingthe shuttle mechanism 28 from being actuated.

The auto-rewind mechanism in a specific embodiment also includes aconnecting rod 384 (FIGS. 18 and 22) between the link 352 and the brakeassembly 195 to deactuate the brake shoes 199, 201 upon the rotation ofthe link 352. In a specific embodiment, the brake assembly 195 is notprovided with the auto-rewind function and in that case the connectingrod 370 would not be provided.

In accordance with various other important aspects of the presentinvention and referring now to FIGS. 26 through 29, in specificalternative embodiments the auto-stop, reset, auto-rewind, and driveassembly braking functions may be accomplished utilizing differentarrangements than those described hereinabove. The alternativeembodiments of FIGS. 26 through 29 will be described in connection withthe projector apparatus of FIGS. 1 through 25 and all parts andassemblies not shown in detail in FIGS. 26 through 29 are substantiallyidentical with those described hereinabove with identical referencenumerals referring to similar identified parts in FIGS. 1 through 25.

Considering now the brake assembly arrangement 395, FIG. 26, whichprovides a similar function as that of the brake assembly 195, the brakeassembly 395 is pivoted for rotation about a pin 405 extending from ahousing portion 406 and is generally formed in the shape of an "L"wherein the two brake shoes 399, 401 are located at the top of the "L,"the pivot point 405 is located at the intersection of the legs of the"L" and a cam follower portion 403 is located along the bottom orhorizontal leg of the "L." The brake assembly 395 is biased toward theclutch plates 160 by a spring 407 (FIG. 27) connected to a clutchassembly support plate extending from the housing 36.

In accordance with an important aspect of the present invention, a brakecam 397 for controlling the brake assembly 395 extends from a doubletrack cam member 420 similar to the cam member 120 (FIG. 23) so as torotate with the control rod 94 and engages the cam follower portion 403(FIGS. 26 and 27) of the brake assembly 395. In a preferred specificembodiment the brake cam 397 is fabricated or molded as an integral partof the double track cam member 420. The cam track 397 is orientedtransversely to the horizontal cam follower leg 403 and operates in acircular path or rotates about the rod 94. The brake engaged position ofthe brake assembly 395 corresponds to the center position 397a of thecam 397. As the control rod 94 is rotated to either side, correspondingto movement of the control selector 90 to the normal forward or reverseposition from the still center position or to the fast forward or fastreverse positions from the center pause position, the raised portions397b, c at either end of the cam track 397 rotate the brake assembly 395in a counterclockwise direction about the pivot pin 405 therebydisengaging the brake shoes 399, 401 from the clutch plates 160.

In accordance with another important aspect of the present invention andreferring now to FIG. 29, a control lever selector detent mechanism 410is provided by a cam track 412, which is formed as an integral part ofthe cam member 420 in a specific embodiment, and a detent cam follower414 extending from a housing portion 416. The detent cam follower 414 isformed by a cam follower button 418 which is biased in an outward mannerby a spring 422. The cam follower button 418 and the spring 422 arepositioned within a receiver cavity 424 formed centrally within thehousing portion 416. The cam track 412 is arranged on the cam member 420so as to position a sloped cam track surface 412a in operative contactwith the detent cam follower 414 when the control selector 90 ispositioned in the fast forward "c" orientation. The surface 412aincludes a convex ramp surface extending outwardly from the center camtrack portion aligned with the detent cam follower button 418 when thecontrol selector 90 is in the pause position. The detent cam follower414 is effective to bias the control selector 90 downwardly, to rotatethe control rod 94 out of the fast forward "c" position. Thus, thecontrol selector 90 will not remain in the fast forward position unlessa force is applied to the control selector by the operator of theprojector to overcome the force of the cam follower 414 against the camsurface 412a.

In the "a," "b," and "d" orientations corresponding to the forward,reverse and rewind modes, the cam track 412 is provided with triangularcross-sectional surfaces. A detent function is provided by the camfollower arrangement 414 as the cam surface 412 is rotated to thesepositions. The cam follower button 418 is biased inwardly as it ridesagainst the inclined triangular surfaces and over the vertices. As thecam track 412 is rotated to position the reverse slope of the triangularcross-sectional surfaces opposite the cam follower button 418, the camfollower button 418 is biased outwardly to provide the detent function.The overall cam surface 412, except for the narrow width portion 412a,forms a center trough having inclined sides. Reverse downwardly slopesurfaces are formed on either side of the ridges formed by the inclinedsides of the trough (an overall saw-tooth or serrated cross section).The center trough extends along the entire width of the cam tracksurface 412 as do the ridges except for the fast forward portion 412a.

The trip arm 466 (FIG. 26) is similar in function and structure to triparm 266 and includes a spring 467 which biases the trip arm 466downwardly to the lower tripped position and is connected between thetrip arm 466 and a pin 468 extending from the housing 36. The trip arm466 includes an offset ledge 478 similar to ledge 278 of the trip arm266 (FIG. 18) that engages and is retained by a finger 444 of a releasearm 440 which is similar to the release arm 240. The release arm 440 ispivoted about a pivot pin 442 fixed to a housing portion and includes acradle 434 formed on an extending arm 436. The release arm 440 is biasedin a counterclockwise direction by a spring 458 extending from therelease arm to a pin 460 extending from the housing 36. The operation ofthe roller 230 and spring wire 232 with the cradle 436 and release arm440 as well as the operation of the trip arm 466 with the release arm440 are substantially identical with that described hereinabove and willnot be discussed in detail.

In accordance with an important aspect of the present invention, arelease locking assembly 550 (FIG. 26) is pivotally mounted adjacent thecradle arm 436 of the release arm 440 and the foot 318 of the retractorlink 312. The release locking assembly 550 is effective to inhibit theoperation of the release arm 440 when the release arm is contacted bythe tension mechanism roller 230 and when the retractor link 312 is inthe lower position. The retractor link 312 being in the lower positioncorresponds to the control lever 90 being in any position of the "H"slot pattern except the normal forward or reverse modes "a" and "b"respectively. When the control selector 90 is in any position except thenormal forward or reverse modes the release arm 440 is inhibited frombeing pivoted to release the trip lever 466. Thus, the auto-stop orauto-rewind modes are not operational. In the forward and reverseprojection modes, the release locking assembly 550 is positioned by theretractor link 312 to be free of the cradle arm 436 of the release arm440 so that the normal operation of the release arm finger 444 torelease the trip arm 466 is effected when the film tension sensor 18 isdisplaced due to the predetermined tension condition in the film.

Considering the release locking assembly 550, a first positioning arm552 and a second locking arm 554 are pivotally mounted at pin location556 by a screw 558. It should be understood, however, that the arms 552and 554 can also be fabricated as a one arm assembly. The positioningarm 552 includes an engaging bifurcated portion 560 which interfits withthe foot 318 of the retractor link 312 to convert the vertical movementof the retractor link 312 to pivoting of the positioning arm 552 aboutthe pivot point at 556. The locking arm 554 is pivotally spring biasedby a spring 562 in a counterclockwise direction and the degree ofrotation is limited by a stop tab 564 of the locking arm 554 located onthe left side of the pivot point 556 which contacts the positioning arm552 so that the locking arm 554 pivots to follow the positioning arm552. The spring 562 is either a tension coil spring connected betweenthe housing and the arm 554 or a torsion spring coiled about the pivotpoint 556. A locking tab 556 extends from the right side of the lockingarm 554 in the vicinity of the cradle arm 436. In the lower retractedposition of the retractor link 312 corresponding to the still, pause,fast forward and rewind modes of operation, the locking tab 566 is inengagement under the cradle arm 436 of the release arm 440 and inhibitspivotal movement of the release arm 440. As the tension roller 230 movesdownward in response to increasing tension in the film (in the still,pause, fast forward and rewind positions) the roller 230 cannot pivotthe release arm 440 since the release arm is attempting to pivotclockwise against the locking tab 566 which is restrained from movementin the counterclockwise direction, the direction the release arm 440 isattempting to displace the arms 552 and 554. In a specific embodiment,the trip arm 466 and the release arm 440 are positioned so that theoffset ledge 478 contacts the release finger 444 even when the trip arm466 is in the lower tripped position. Thus, when the trip arm 466 israised to the reset position by the control selector 90, the release armdoes not need to be pivoted clockwise to allow movement of the trip arm466 although the release arm 440 is not restrained against clockwisepivoting.

In accordance with several important aspects of the present invention,the several assemblies and subassemblies described hereinbefore functionindependently and cooperatively to provide the projector 10 with anauto-stop mode. Further, the projector can be conditioned to rewind thefilm automatically (auto-rewind mode) responsive to the automaticstopping condition. Briefly, as discussed hereinabove when the projectoris being operated in the normal forward projection mode "a," theautomatic stopping mechanism is set to respond to tension in the filmwhereby the tension sensor 18 is actuated to cause the projector to beplaced in the still projection mode. Thereafter, the projector can beautomatically shifted to the auto-rewind mode if the projector isequipped with such a mechanism. Although the anticipated use will be tocomplete the rewind of the full length of film the operator mayinterrupt this sequence by depression of the safety interlock buttonwhereupon the control lever 90 may be positioned to other operatingmodes.

To initiate the threading of film through the film path of theprojector, the operator displaces the control selector 90 to the forwardprojection position "a." Specifically the trip arm 466 is lifted andengaged by the release arm 440 in the upper reset position. Further, thetension sensor 18 is in an operational sensing mode and is displaced toan actuating high film tension condition when the end of a film isreached and no additional film is available to be withdrawn from thesupply reel 86. As the film becomes taut, the release arm 440 is pivotedabout the pivot pin 442 and the finger 444 moves clear of the offsetledge 478 on the trip arm 466. The spring 488 then biases the trip arm466 downwardly causing several functional actuations to be initiatedand/or completed.

With the downward movement of the trip lever 466, the foot 494 displacesthe control lever 90 and the frame 190 from the forward projection modeto the still projection mode. Due to the movement of the control lever90, the control rod 94 and the frame 190, the take-up drive assembly 65is deactuated through the clutch assembly 60. Simultaneously, theshuttle retractor link 312 is deactuated through actuator 206 as thecontrol rod 94 rotates. Thus, film transporting action of the projectormechanisms is stopped with the control selector 90 in the stillposition. The control lever 90 can now be shifted to either orientation"b" or "d" corresponding to the reverse or rewind modes. The controllever 90 as discussed hereinabove may also be positioned to the "c" fastforward position upon the actuation of the safety interlock button 97,but this position, of course, is not recommended.

Assuming that the operator cares to review the film at normal frame ratespeed, the lever is shifted to the reverse "b" position. Through thecontrol rod 94 and clutch control assembly 102, the clutch assembly 60is actuated to drive the supply reel 86 to function as a film take-upreel. When the trip arm 466 caused the control lever 90 to be lowered,the control lever 90 through rotation of control rod 94 and actuatorlink 206 caused the shuttle 28 to be retracted and the fire shutter (notshown) to be introduced in the aperture at the projection station 20 asthough the projector had been manually conditioned for still projection.The trip arm 466 and the release arm 440 remain in the tripped conditionuntil the projector is again conditioned for forward projectionwhereupon it again is in the reset mode and the tension sensor 18 isoperable to actuate an auto-stop function when the control selector 90is in the forward or reverse modes, positions "a" and "b" respectively.

After the auto-stop function has been actuated, the operator will mostlikely elect to rewind the film through the projector to prepare forprojection of another film. From the still mode orientation, the controllever 90 is displaced to the rewind (fast reverse) orientation "d."Through the control rod 94, and clutch control assembly 102, the dualclutch drive assembly 60 functions to drive the film rapidly onto thesupply reel 86. The trip arm 466 remains tripped, the gate and tensioncontrol actuator 114 remains deactivated and the shuttle retractor link312 is actuated to retract the shuttle 28 and position the fire shutterin the projection aperture.

Following reverse projection or rewind of the film the projector mayagain be in condition for forward film transport. As the controlselector is lifted from the "still" orientation to the "a" position, thetrip arm 466 is raised to the upper reset position and retained by therelease arm 440. Hence, the projector is again conditioned for auto-stopoperation on the next occasion that the predetermined film tensioncondition occurs during forward or reverse film transport.

In accordance with another important aspect of the present invention andin a preferred specific embodiment, the projector 10 is provided withactuating mechanisms to automatically accomplish rewinding of the filmreferred to as an auto-rewind function upon the occurrence of apredetermined film tension condition. To accomplish the auto-rewindfunction, an auto-rewind control actuator assembly 500 is providedincluding an auto-rewind shaft 502 disposed across the length of theprojector 10 and mounted for pivotal movement and restrained againstaxial movement by a bearing 504 carried by an extending housing portion506 at one end near the trip arm 466, by a similar bearing 508 carriedby an extending housing portion 510 near the brake assembly 395 and by ahousing portion 512 to the right of the bearing 508 that extendsoutwardly to provide a stop for the shaft 502. An auto-rewind actuatorarm 514 is carried by the shaft 502 for rotation therewith andrestrained against relative movement thereto. The auto-rewind clutchactuator arm 514 extends outwardly and downwardly in the vicinity of theclutch actuator arm 132 and is provided with a screw or threaded rod andnut arrangement 516 to contact the actuator arm 132.

Upon rotation of the shaft 502 in a clockwise or righthand direction,FIG. 26, the auto-rewind actuator arm 514 rotates to displace the clutchactuator 132 inwardly to actuate the reverse drive subassembly 70 in apositively driven condition to achieve fast reverse operationindependently of the position of the control selector 90. In the dualclutch drive assembly 60 as shown in FIG. 26, the clutch actuators 130and 132 extend beyond the center of the drive assembly and actuate thedrive disc 170 at a higher position than the actuators shown in FIG. 22.A switch (not shown) mounted adjacent the auto-rewind actuator arm 514is actuated to control the operation of an auto-rewind indicating lampprovided within the interlock button 97. However, the overall operationis similar.

Also extending from the auto-rewind control actuator arm 514 and moldedintegrally therewith in a specific embodiment is an auto-rewind brakeassembly actuator arm 520. The auto-rewind brake assembly actuator 520extends downwardly in the vicinity of the brake shoes 399, 401 andincludes a cam member 522 which is dimensioned to displace the brakeassembly 395 to the "off" position when the shaft 502 is rotated.

To accomplish the rotation of the shaft 502 and the auto-rewind functionas the trip arm 466 returns to the lower position, a flange 524 isprovided on the trip arm 466 extending outwardly from the trip arm 466and including a pin receiving hole 526. The flange 524 also has acentral aperture 528 through which the shaft 502 extends. A translationcollar 530 is carried by the shaft 502 that extends into the vicinity ofthe receiving hole 526 and the pin 532 extends from the hole 526 intothe translation collar 530 carried on the shaft 502. The translationcollar 530 is carried by the shaft 502 so as to rotate therewith. As thetrip arm 466 moves downward after a predetermined film tension conditionhas occurred and the release arm 440 has been pivoted releasing the triparm 466, the pin 532 rotates the translation collar 430 and thus theshaft 502 to initiate the auto-rewind sequence.

When the trip arm 466 moves downward and the foot 494 rotates theselector lever 90 into the still position, the shuttle retractor link312 also moves downward to deactuate the shuttle mechanism 28 asdescribed hereinabove. In accordance with a further important aspect ofthe present invention, the gate and side tension actuator link 114 isalso moved upwardly to deactuate the associated mechanism to remove thegate and side tension at gate 26 in response to an auto-rewind link 534which is pivoted at shaft 536. The auto-rewind link 534 has a left tabportion 538 which is engaged by an extending tab 540 of the trip arm 466so as to rotate the right side of the link 534 upwardly against anextending and engaging tab 542 of the gate and side tension actuatorlink 114.

Thus upon the trip arm 466 moving downward after a predetermined filmtension condition in selected operational modes and after pivoting ofthe release arm 440, the auto-rewind sequence occurs in addition to thecontrol selector 90 being positioned in the still mode. In theauto-rewind sequence, the gate and side tension actuator link 114 andthe shuttle retractor link 312 are positioned to the deactuatedpositions. The shaft 502 is rotated and the auto-rewind mechanism 500 iseffective through actuator arms 520 and 522 to condition a positivedrive mode of the reverse drive subassembly 70 and remove the brakeassembly 395. The fast reverse automatic rewind mode continues until theoperator moves the control selector 90 to the forward "a" position whichresets the trip arm 466 whereupon the selector 90 is lowered to thestill position and all film transport operation ceases.

In accordance with further important aspects of the present invention,the operative mechanical components of the projector 10 are mounted onthe single, unitarily molded chassis or housing 36. The housing 36 in aspecific embodiment is foam molded and cured after the molding operationto form a smooth hard outer shell or non-porous surface while achievinga housing that is lightweight and inexpensive to produce in amanufacturing process.

The housing 36, referring to FIGS. 1 and 2, includes a generallyrectangular base 600 and a unitarily molded concave upstanding edgewall602 further defined and circumscribed by a strengthening flange 604. Thestrengthening flange portion 604 is also provided with a lip 606 aboutthe perimeter to interfit with a rear housing cover (not shown) securedby screws into the threaded sleeve portions 608, 610, 612, 614, 616 and618 which are molded integrally with the housing 36 and includerespective strengthening ribs and flanges. The threaded sleeves 614, 616and 618 are molded as raised portions of the base 600.

Referring now to FIGS. 1 through 13 and concerning other importantaspects of the present invention, various portions and cooperatingcomponents of the assemblies and mechanisms described hereinbefore areintegrally molded with the housing.

Specifically, concerning the film path of the projector as defined byvarious integrally molded portions of the housing, a sloped extendingguiding surface 620 is provided adjacent and below the tension sensingassembly 18. Further, a curved guiding rib 622 is molded opposite thesurface 620 and forms a part of a downwardly curving extending surface621 that provides clearance for large supply reels. An elongatedhorizontal recess 624 is formed in the molding process between theshuttle mechanism 28 and the take-up assembly 16 near the base 600.Intermediate the recess 624 and the shuttle 28, a curved extending rib626 and an opposed recessed sidewall surface 628 are provided in asubstantially vertical arrangement to define a passageway or recess 629.The film is threaded over the tension sensor mechanism 18 between theopposed surfaces 620 and 622, downward past the shuttle 28 and throughthe gate 26, between the surfaces 626 and 628, horizontally along therecess 624 and into the area of the take-up assembly 16.

A curved elongated slot 630 is provided to allow passage through thehousing 36 and movement of the roller 230 and the cradle 234. A guideroller 632 is positioned below the guide surface 620 and rotatablymounted through a hole 634 in the housing. Similarly, cooperating guiderollers 636 and 638 are arranged and rotatably mounted through holes 633and 635 in the housing wall 602 at the end of the recess 624 near thetake-up assembly 16 in semicircular receiving recesses 640 and 642respectively. The take-up spindle 64 passes through a hole 644 in thehousing. A circular receiving recess portion 646 is defined about thecentral hole 644 by two semicircular ribs 637 and 639 to accept thetake-up reel 16 which is a self-threading or automatic threading reel ina specific embodiment. A generally rectangular take-up cover (not shown)overlays the circular recessed portion 646 and the take-up reel 16 andis retained by the housing 36 by means of the interlocking of a pair oftabs on the cover into a pair of slotted portions 648 and 650 formedthrough a housing ledge 652. A spring clip of the take-up coverinterfits with a receiving slot 654 near the base 600 of the housing 36.The take-up reel cover generally forms a seal around the take-up reel. Atake-up threading air assist vent 656 is provided through the housing 36in the lower right portion of the recess 646 to supply a directed streamof air from the circulation fan toward the take-up spindle 64 to assistin the automatic threading of the film 12 onto the take-up reel 16.

A control and mechanism cover overlays the right half of the housing 36adjacent the projection lamp 22, the shuttle mechanism 28 and theprojection lens 24 and includes a pair of extending tabs interfittingwith receiving slots 658 and 660 formed along the base 600. A pair ofdeformable spaced apart prongs are provided on the control mechanismcover that engage a central rod portion 662 of an extending square frame664 which opens to the rear side of the housing 36. Ventilating air isalso provided through the passage of the square frame 664 to theadjacent projection lamp 22. A similar arrangement is provided by anextending frame 666 having a central rod portion 667 above theprojection lens 24. The control and mechanism cover also overlays theprojection lamp 22 so as to prevent light from radiating into theenvironment surrounding the projector 10 and directs light by means of areflective inside panel toward the projection lens 24.

Various openings are formed in the control and assembly cover to allowaccess to the operating controls such as the framer control, the filmspeed control lever, the main control switch, the lens adjustmentcontrol lever, the film counter and the film size selection lever (notshown in detail). The control and assembly cover is further providedwith extending surfaces to cooperate with the molded film path definingstructures of the housing 36 discussed hereinabove. A film countermechanism receiving passage 668 is provided through a hollow extendingplatform 670 of the housing 36 along with an elongated slot 672 for thepassage of a film size selector lever. An elongated channel 674 isformed along the top surface of the extending platform 670 with anarrower "T"-shaped retaining arrangement 676 formed in the channel 674at the interior end by a pair of upstanding inwardly curved fingers 677,679. A projection lamp ejector lever 678 is retained in the channel 674and the arrangement 676 by the engagement of tabs on the lever 678 beingretained by the fingers 677, 679. The ejector lever 678 is effective toassist in the removal of the projection lamp 22 upon pivoting of thelever 678 about the retaining slot 676.

A large central opening 680 is provided through the housing 36 adjacentthe projection lamp 22, the shuttle 28 and associated mechanism, theshutter 30 and the projection lens 24 to provide space for the mountingof these mechanism assemblies.

Cooperating with the rear housing cover, a pair of carrying handlereceiving slots 682 and 684 (FIGS. 4 and 6) are provided to receiveprojecting pins extending from the carrying handle (not shown). Whenassembled, the handle is rotatably retained between the rear housingcover and the housing 36 as the handle projecting pins rotate within theslots 682 and 684. The carrying handle is movable into a flat recessedstorage position into a receiving portion formed in the rear cover.

An extending hollow control platform 685 is molded in the edge wall 602below the projection lens 24. A slot 686 is provided adjacent the "H"shaped control selector slot 92 in the vertical surface of the controlplatform 685 for the passage of a film speed control (frame rate) lever.The edge wall 602 of the housing 36 in the area of the slot 686 (FIGS. 2and 11) includes a series of detent tabs 688 which cooperate with thefilm speed control lever to define film speed detent positions. The filmspeed control lever extends from a pivotal adjustment arm which rotatesat one end between a pair of spaced tabs 687, 689 extending from thebase 600 and forming a receiving channel 690.

The driven shaft 80 of the supply assembly 14 passes through a hole 692in the edgewall 602 of the housing 36. A recessed quadrant-shapedsurface 694 is formed in the edgewall 602 adjacent the hole 692 andcooperates with an extending tab of the arm assembly 88 to provide stoppositions for the arm along with a detent mechanism internal to the arm78. A larger recessed quadrant surface 696 of the edgewall 602 is formedby a downwardly sloped extending "ski-slope" surface 698 to allow therotation of the quadrant-shaped arm assembly 78 from a first upwardlyrotated position for large supply reels as shown in FIG. 13 to adownward position for small supply reels and for storage. The armassembly 78 substantially matches or meets flush with the frontextending edge of the sloped surface 698. The volumetric shape of thearm assembly is identical to that defined by the recessed quadrantportion 696.

The drive shaft 72 driving the shaft 80 through the gear pair 82 isrotatably supported in a bearing member 700 which is mounted by means ofscrews into threaded portions of an extending post 702 of the housingthat includes several strengthening ribs.

The bearing member 50 and the mechanism support plate 52 are mounted toan extending housing post 704 by means of screws into threaded positionsof the post 704 which is slotted at 706 to allow clearance for themounting position of the bearing member 50.

In a specific embodiment, several idler rollers or snubbers 708 (FIG.27) are arranged circumferentially around the dual clutch drive assembly60 to contact the drive discs 150 and support the clutch assembly. Thesnubbers 708 each are rotatably mounted by means of attached shafts 710in bearings 712. The bearings 712 are attached to extending posts 714 ofthe housing 36.

The dual clutch drive assembly 60 is supported through the shaft 62 by asupport plate 716 which is mounted to extending posts 718, 720 and 722by screws into threaded sleeves in the posts 718, 720 and 722. The posts718, 720 and 722 are molded with the housing 36 and include severalstrengthening ribs. The support plate 716 also carries the drive shaft72. The clutch actuator support platform 135 (FIGS. 14, 17, 18 and 27)is attached to two extending molded posts 726 and 728 by means of screwssecured into threaded sleeve portions of the posts 726 and 728.

The bearing members 96 at either end of the projector for carrying thecontrol rod 94 are attached to extending posts or planar elements 730and 732 by means of screws secured into threaded sleeve portions of theposts 730 and 732.

Although the housing 36 and the above-described housing portions,structures and defining surfaces are integrally molded in a preferredspecific embodiment, it should be understood that the various housingportions, structures and defining surfaces may also be attached andformed by cementing, heat-stacking and other conventional methods.

While there has been illustrated and described several embodiments ofthe present invention, it will be apparent that various changes andmodifications thereof will occur to those skilled in the art. It isintended in the appended claims to cover all such changes andmodifications as fall within the true spirit and scope of the presentinvention.

What is claimed as new and desired to be secured by Letters Patent ofthe United States is:
 1. In a motion picture projector having a forwardand reverse film transporting drive assembly selectively actuable in atleast a forward and a reverse mode, an assembly for sensing apredetermined film tension condition and a controller assembly forselecting various operating modes, a control mechanism for selectivelyactuating a reverse mode of operation upon the occurrence of thepredetermined film tension condition comprising:means responsive to saidtension sensing assembly in a first predetermined projector operatingmode for conditioning said controller assembly to a second predeterminedoperating mode when said predetermined film tension condition is sensed;and means for actuating said film transporting drive assembly in areverse mode, said controller assembly conditioning means comprisingmeans movable between a first sensing position and a second operatedposition for operating said controller assembly and means responsive tosaid tension sensing assembly for controlling the position of saidoperating means, said reverse mode actuating means being coupled to saidoperating means of said controller assembly conditioning means andresponsive to actuate said film transporting drive assembly in thereverse mode upon said operating means moving from said first sensingposition to said second operating position, said film transporting driveassembly comprises a pivotable reverse drive actuating member which isdisplaced to actuate said drive assembly in a reverse mode, the movementof said operating means from said first to said second position is alinear displacement, and said reverse mode actuating means comprisesmeans for translating said linear displacement movement of saidoperating means to a rotational movement, means for coupling saidrotational movement of said translating means and means coupled to saidcoupling means for displacing said pivotable reverse drive actuatingmember upon rotation of said translating means.
 2. The reverse modeactuating control mechanism of claim 1 wherein said second predeterminedoperating mode is a mode wherein the film transporting drive assembly isnot actuated by said controller assembly, said pivotable reverse driveactuating member being displaced at a first end on one side of thepivotal point when actuated by said projector controller assembly and ata second end on the opposite side of said pivotal point by saiddisplacing means.
 3. The reverse mode actuating control mechanism ofclaim 1 wherein said translating means comprises a pivotal actuatingmember fixedly carried at one end by said coupling means and pivotablycarried at the other end by said operating means of said controllerassembly conditioning means.
 4. The reverse mode actuating controlmechanism of claim 3 wherein said coupling means comprises a control rodand said displacing means is fixedly carried by said control rod.
 5. Thereverse mode actuating control mechanism of claim 4 wherein said filmtransporting drive assembly comprises a brake assembly which ispivotally actuable and said displacing means further comprises a brakeassembly displacing member.
 6. The reverse mode actuating controlmechanism of claim 5 wherein said brake assembly displacing member isformed as an extending member of said displacing means.
 7. The reversemode actuating control mechanism of claim 6 wherein said brake assemblydisplacing member includes a cam surface and said brake assemblyincludes a cam follower for cooperative engagement with said camsurface.
 8. The reverse mode actuating control mechanism of claim 1wherein said projector further comprises a gate and side tensionactuating link which is movable between first and second verticalpositions for actuating an associated gate and side tension mechanism,said reverse mode actuating means further comprising gate and sidetension means for deactuating said gate and side tension actuating link.9. The reverse mode actuating control mechanism of claim 8 wherein saidgate and side tension link deactuating means comprises a pivotaldeactuating member positioned between said gate and side tension linkand said operating means of said controller assembly conditioning means,said operating means comprises a first engaging tab for pivoting saidpivotal member upon movement of said operating member to said secondoperating position, and said gate and side tension link comprises asecond engaging tab which is engaged upon pivoting of said pivotaldeactuating member.
 10. A control mechanism for selectively actuating amotion picture projector to a rewind mode of operation upon tooccurrence of a predetermined film tension condition, the motion pictureprojector having a forward and reverse-rewind film transporting driveassembly selectively actuable in at least a forward and a reverse-rewindmode; an assembly for detecting the predetermined film tensioncondition; a controller assembly manually shiftable in a plurality ofpositions for selecting various operating modes of the motion pictureprojector; and a position shifting assembly responsive to the tensiondetecting assembly and effective to shift the controller assembly from aforward mode to a non-film transporting mode upon the occurrence of thepredetermined film tension condition, the position shifting assemblylinearly moveable between a first detecting position and a secondoperated position, the rewind mode actuating control mechanismcomprising:means connected to said position shifting assembly fortranslating the linear movement of said position shifting assembly fromsaid first detecting position to said second operated position to arotational movement; means for coupling said rotational movement of saidtranslating means; and means connected to said coupling means foractuating said film transporting drive assembly in the reverse-rewindmode of operation, said film transporting drive assembly comprising apivotable reverse drive actuating member which is displaced to actuatesaid film transporting drive assembly in the reverse rewind mode, saidactuating means comprising an actuating arm for displacing said reversedrive actuating member upon rotation of said translating means.
 11. Thereverse mode actuating control mechanism of claim 10 wherein saidtranslating means comprises a pivotal actuating member fixedly carriedat one end by said coupling means and pivotably carried at the other endby said position shifting assembly.
 12. The reverse mode actuatingcontrol mechanism of claim 11 wherein said coupling means comprises acontrol rod mounted for rotation by said pivotal actuating member. 13.The reverse mode actuating control mechanism of claim 12 wherein saidactuating arm is fixedly carried by said control rod.
 14. In a motionpicture projector having a forward and reverse film transporting driveassembly selectively actuable in at least a forward and a reverse mode,an assembly for sensing a predetermined film tension condition and acontroller assembly for selecting various operating modes, a controlmechanism for selectively actuating a reverse mode of operation upon theoccurrence of the predetermined film tension condition comprising:meansresponsive to said tension sensing assembly in a first predeterminedprojector operating mode for conditioning said controller assembly to asecond predetermined operating mode when said predetermined film tensioncondition is sensed; and means for actuating said film transportingdrive assembly in a reverse mode, said controller assembly conditioningmeans comprising means movable between a first sensing position and asecond operated position for operating said controller assembly andmeans responsive to said tension sensing assembly for controlling theposition of said operating means, said reverse mode actuating meansbeing coupled to said operating means of said controller assemblyconditioning means and responsive to actuate said film transportingdrive assembly in the reverse mode upon said operating means moving fromsaid first sensing position to said second operating position, said filmtransporting drive assembly comprises a pivotable reverse driveactuating member which is displaced to actuate said drive assembly in areverse mode, the movement of said operating means from said first tosaid second position is a linear displacement, and said reverse modeactuating means comprises means for translating said linear displacementmovement of said operating means to a rotational movement, means forcoupling said rotational movement of said translating means and meanscoupled to said coupling means for displacing said pivotable reversedrive actuating member upon rotation of said translating means, saidtranslating means comprises an elongated pivotably mounted memberpivotally connected at one end to said operating means of saidcontroller assembly conditioning means; said coupling means comprises aconnecting rod carried at said second end of said elongated pivotablymounted translating member and a pivot plate connecting said connectingrod to said displacing means; and said displacing means comprises apivotably mounted displacing member.